全文获取类型
收费全文 | 10308篇 |
免费 | 436篇 |
国内免费 | 623篇 |
专业分类
系统科学 | 476篇 |
丛书文集 | 289篇 |
教育与普及 | 198篇 |
理论与方法论 | 57篇 |
现状及发展 | 52篇 |
研究方法 | 19篇 |
综合类 | 10270篇 |
自然研究 | 6篇 |
出版年
2024年 | 43篇 |
2023年 | 133篇 |
2022年 | 264篇 |
2021年 | 241篇 |
2020年 | 213篇 |
2019年 | 132篇 |
2018年 | 132篇 |
2017年 | 172篇 |
2016年 | 211篇 |
2015年 | 337篇 |
2014年 | 477篇 |
2013年 | 487篇 |
2012年 | 527篇 |
2011年 | 549篇 |
2010年 | 509篇 |
2009年 | 620篇 |
2008年 | 661篇 |
2007年 | 639篇 |
2006年 | 485篇 |
2005年 | 479篇 |
2004年 | 333篇 |
2003年 | 335篇 |
2002年 | 357篇 |
2001年 | 326篇 |
2000年 | 293篇 |
1999年 | 368篇 |
1998年 | 265篇 |
1997年 | 264篇 |
1996年 | 250篇 |
1995年 | 208篇 |
1994年 | 195篇 |
1993年 | 157篇 |
1992年 | 119篇 |
1991年 | 152篇 |
1990年 | 131篇 |
1989年 | 114篇 |
1988年 | 93篇 |
1987年 | 54篇 |
1986年 | 24篇 |
1985年 | 7篇 |
1984年 | 4篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1968年 | 1篇 |
1957年 | 2篇 |
1955年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
With the Fe304@MSS (magnetic mesoporous silica spheres)-NH2 as the carrier and the glutaraldehyde as crosslinking agent, the immobilized laccase has been pre- pared and characterized by XRD, IR, SEM and BET etc. Under the optimal conditions, the removal efficiency of 2,4-DCP reached 88 % and the removal efficiency still remained 61.5 % after five cycles of operations. In virtue of GC-MS analysis, 2,5-dimethoxyl-l,4-quinone, 2-chlo- rine-l,4-dimethoxyl benzene, 3,3'-dichlorine-4,4'-dimeth- oxyl biphenyl, maleic acid phenol ester, and three kinds of maleic acid, alcohol ester, and para-hydroxyl phenol ester compounds have been identified as intermediate and final degradation products of 2,4-DCP, respectively. Besides, the degradation products of 2,4-DCP have been confirmed by performing the 1H-NMR and 13C-NMR experiments, further demonstrating the degradation mechanism of 2,4- DCP by the immobilized laccase. 相似文献
992.
Ahmad Hussain Xijun Xu Guoliang Yuan Yiping Wang Ying Yang Jiang Yin Junming Liu Zhiguo Liu 《科学通报(英文版)》2014,(36):5161-5169
The multiferroic properties of Bi Fe O3-based ceramics were improved through optimizing their sintering method and doping with certain rare earth elements in pure Bi Fe O3. Some methods, especially liquid-phase sintering method has largely decreased the densities of oxygen vacancies and Fe2in Bi Fe O3-based ceramics, and thus their resistivity became high enough to measure the saturated polarization and the large piezoelectric d33 coefficient under the high electric field of [150 k V/cm. Besides,multiferroic properties were improved through the rare earth elements’ doping in pure Bi Fe O3. Magnetization commonly increases with the proportional increase of Nd,La, Sm and Dy contents up to *30 %, while ferroelectric phase can transform to paraelectric phase at a certain proportion. An improved magnetoelectric coupling was often observed at ferroelectric phase with a relatively large proportion. Besides, an enhanced piezoelectric coefficient is expected in Bi Fe O3-based ceramics with morphotropic phase boundaries as they are already observed in thin epitaxial Bi Fe O3 films. 相似文献
993.
Yan Huang Yanjie Xi Yuxiang Yang Cheng Chen Hongming Yuan Xiangnong Liu 《科学通报(英文版)》2014,59(5-6):509-520
With the Fe3O4@MSS (magnetic mesoporous silica spheres)–NH2 as the carrier and the glutaraldehyde as crosslinking agent, the immobilized laccase has been prepared and characterized by XRD, IR, SEM and BET etc. Under the optimal conditions, the removal efficiency of 2,4-DCP reached 88 % and the removal efficiency still remained 61.5 % after five cycles of operations. In virtue of GC–MS analysis, 2,5-dimethoxyl-1,4-quinone, 2-chlorine-1,4-dimethoxyl benzene, 3,3′-dichlorine-4,4′-dimethoxyl biphenyl, maleic acid phenol ester, and three kinds of maleic acid, alcohol ester, and para-hydroxyl phenol ester compounds have been identified as intermediate and final degradation products of 2,4-DCP, respectively. Besides, the degradation products of 2,4-DCP have been confirmed by performing the 1H-NMR and 13C-NMR experiments, further demonstrating the degradation mechanism of 2,4-DCP by the immobilized laccase. 相似文献
994.
应用Green函数对Laplace方程进行求解,得到了积分形式的解,并在对求出的解进行了具体的运用,同时也对该解进行总结分析推广到n维情况. 相似文献
995.
从U (2 ) L ×U (2 ) R 手征孤立子模型出发 ,通过(πωf1 )模型考察了轴矢量介子 f1 (1 2 82 )的时间分量和空间分量的量级与其手征伙伴ω的关系。通过对 f1 运动方程的大NC 分析 ,发现 :f1 的时间分量 f0 具有O(1N3/2C)的量级 ,其空间分量 fi 具有和ω空间分量ωi 相同的O(1NC)量级。因此 ,在研究孤立子转动激发时 ,fi 和ωi 应该同时考察。这是首次对于 f1 在手征孤立子模型中的效应进行定量估算。 相似文献
996.
MENG Xiang |rui SHU Hang . Huainan Institute of Technology Huainan China . State Plan Council Beijing China 《系统科学与系统工程学报(英文版)》2000,(1)
1 Coal Quality Balance and Its Significance[1]Coal quality balance is to make a comprehensive plan concerning excavation steps and coalamount disposition of different coal seams based upon the natural coal-preservation stateand its relation with mining engineering in the three dimensional space so as to have thequality of coal excavated from different districts blended and coordinated the greatestextent possible and ensure the coal quality uniformity and stability,thus raise economicand soc… 相似文献
997.
998.
建立工程造价管理技术系统应立足于基础工作,完善工程定额,收集整理已建工程和在建工程的造价资料,建立工程价格信息网,研究工程造价管理理论- 相似文献
999.
简要介绍了 CO2 气体激光器、波导 CO2 激光器件微小型化的现状 ,着重介绍了自己研制的全金属环状波导管 CO2 激光器件 .该器件按增益体积整体缩放 ,扩散冷却型新技术、新概念 .并指出 ,该新技术、新概念将是今后气体 CO2 激光器微小型高功率化的最有效途径之一 . 相似文献
1000.